Orofacial and Skeletal Manifestations of Hypophosphatemic Rickets in Fanconi Bickel Syndrome

Veena R, Babitha. K, Anuradha Pai

  Open Access OPEN ACCESS  Peer Reviewed PEER-REVIEWED

Orofacial and Skeletal Manifestations of Hypophosphatemic Rickets in Fanconi Bickel Syndrome

Veena R1, Babitha. K2,, Anuradha Pai3

1Reader in department of oral medicine & radiology, The Oxford dental college, Bommanahalli, Hosur road, Bangalore 560068, Karnataka, India

2Post graduate student in department of oral medicine & radiology, The Oxford dental college, Bommanahalli, Hosur road, Bangalore 560068, Karnataka, India

3Professor and head of the department of oral medicine & radiology, The Oxford dental college, Bommanahalli, Hosur road, Bangalore 560068, Karnataka, India

Abstract

Wide array of systemic disorders have their manifestations in oral cavity. These disorders can be mainly syndromic, metabolic or congenital diseases. The dental features in these disorders can be expressed on a wider latitude from mild to extensive forms. Here is an incidence of a case of hypophosphatemic rickets in Fanconi Bickel syndrome with multiple oral and general phenotypic features.

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Cite this article:

  • R, Veena, Babitha. K, and Anuradha Pai. "Orofacial and Skeletal Manifestations of Hypophosphatemic Rickets in Fanconi Bickel Syndrome." American Journal of Clinical Medicine Research 2.4 (2014): 68-71.
  • R, V. , K, B. , & Pai, A. (2014). Orofacial and Skeletal Manifestations of Hypophosphatemic Rickets in Fanconi Bickel Syndrome. American Journal of Clinical Medicine Research, 2(4), 68-71.
  • R, Veena, Babitha. K, and Anuradha Pai. "Orofacial and Skeletal Manifestations of Hypophosphatemic Rickets in Fanconi Bickel Syndrome." American Journal of Clinical Medicine Research 2, no. 4 (2014): 68-71.

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1. Introduction

Multiple missing teeth, mobility, delayed eruption are some of the signs and symptoms well appreciated in a dental setting. However, when these present together inappropriate to the patient’s age, along with characteristic general physical features; this may create a high suspicion of underlying severe systemic disorder. A systematic and careful approach to such characteristic manifestations may guide a dentist in diagnosing rare conditions and their orofacial features. Such disorders may evoke special interest in the field of dentistry in discovering the unknown dental anomalies.

2. Case Report

A 17-year-old adolescent male came to our out-patient department with a chief complaint of multiple missing teeth in his oral cavity since many years. Adding to the above complaint, patient’s parent revealed that they did not observe normal shedding and eruption of subsequent teeth in their child in comparison to the elder sibling. Also permanent teeth which erupted late in time were found mobile in a short span of time.

Since the patient presented with distinct physical characteristics for his age, on interrogation, the parent revealed that the patient was suffering from a medical illness and was under management for the same. However, they failed to provide us the details of his illness. Also they reported a history of delayed milestones. Patient’s intelligence quotient was normal. Parents and elder sibling of the patient were normal. His parents had a consanguineous marriage.

On examination, the patient was asthenic and poorly nourished, had typical waddling gait, short statured with a height of 126 cm (< 20th percentile for the age ) and weighed about 25 kg (<10th percentile for the age). Skeletal examination revealed deformed chest, rachitic rosary (beading of ribs), Harrison’s sulcus, transverse sulcus, bowed hands and (genus valgum) knock knees. Widening of epiphyseal ends of wrist, elbows, and ankle joints were also noticed (Figure 1).

Figure 1a and 1b. Patient presenting with ricketic features

Extra oral examination revealed brachycephaly, hypertelorism, broad nose, mid face deficiency (Figure 2a and 2b). Intraorally multiple missing teeth with poorly formed alveolar ridges were noted. Grade 1 and grade 2 mobility was present in many teeth(Figure 3a and 3 b).

Based on the skeletal findings, a provisional diagnosis of rickets with orodental manifestations was considered. Necessary investigations were advised and the patient was instructed to follow up with all the previous medical records before charting a treatment plan.

Orthopantomograph revealed reduced height of maxillary and mandibular alveolar ridges with multiple embedded teeth in both jaws. Incomplete root formation and open apex of embedded upper and lower premolars and molars were appreciated. Other findings included rarefying osteitis in relation to periapical region of lower left canine and taurodontism in upper left first molar (Figure 4). In addition to the above findings, lateral cephalogram revealed severely deficient maxilla and true skeletal class III malocclusion with open bite (Figure 5).

Figure 5. Lateral cephalogram reveals class III malocclusion and midface deficiency
Figure 6. Hand wrist radiograph showing indicators of delayed skeletal development

Hand wrist radiograph examination showed the absence of sesamoid bone in the proximal phalanx of 1st digit and failure of fusion of epiphysis of proximal phalanx of 2nd digit and middle phalanx of 3rd digit (Figure 6). Knee radiograph revealed presence of radiopaque metal rods in femur and tibial bones suggestive of treated fractures (Figure 7).

Figure 7. knee X ray shows treated fracture of left and right tibial bone.

During the patient’s first followup his medical reports were assessed which revealed the following data. At the age of 2 ½ years, patient had problems of developmental delay, poor weight gain, polyuria, abdominal distension, skeletal deformities, and recurrent respiratory infections. Ricketic features like open anterior fontanelle, fiddle shaped chest, Harrison’s sulcus, rachitic rosary, cat’s back, lateral bowing of fore-arms and legs; and glycogen storage disorder signs like protuberant abdomen with soft palpable liver was present. He was diagnosed to have FBS in his childhood and since then has been on treatment with neutral phosphate solution, calcirol granules and alkali solution. Childhood history of treated case of fractured leg was also present. His present biochemical reports of serum electrolytes, calcium and phosphates, urine and serum creatinine were within normal limits.

Thus with the childhood illness reports, clinical signs and symptoms and radiological investigations, we came to the final diagnosis of oral manifestations of hypophosphatemic rickets in FBS. The oral manifestations included all the features listed in Table 1.

Table 1. clinical, radiologic and histological dental findings in our patient

The patient is currently under the medical management of alkali solution, calcirol granules and neutral phosphate solution.

Dental management: Our patient was counseled and educated on the maintenance of good oral hygiene. He underwent a thorough oral prophylaxis. Mobile lower left lateral incisor was extracted and subjected to histopathological examination which revealed the presence of interglobular dentin. On subsequent visit, cusp tip of lower left canine was appreciated clinically at this age of 17 years. The patient at present is under regular follow up.

3. Discussion

Fanconi syndrome is a systemic, autosomal recessive, inherited syndrome usually resulting in proximal renal tubular acidosis (RTA), of which FBS is one of the entity. [1] FBS, has also been known as hepatorenal glycogenosis with renal Fanconi Syndrome and categorized under Glycogen Storage Disease Type XI represents an extremely rare disorder. [2] In 1949, Guido Fanconi and Horst Bickel described it for the first time. [2, 3] According to Santer et al, a total of 109 cases in 88 families have been reported. [3, 4, 5] Reported cases are mainly from all parts of Europe, Turkey, Israel, Arabian countries of the Near East and North Africa, Japan, and North America. [2] Search in Pubmed for “oral manifestations of FBS” yielded a result of only one such reported case. Parental consanguinity was present in index case and the literature suggests its presence in 2/3rd of patients of FBS [4, 5].

Features typical to FBS presents with variable degrees of manifestations of hypophosphatemic rickets, RTA, and hepatomegaly resulting from GSD XI. [6] Hypophosphatemic rickets in Fanconi syndrome presents with failure of production of 1,25-dihydroxy vitamin D from its precursor 25-hydroxy vitamin D and defective resorption of phosphate in the proximal renal tubule. [7] This causes imbalance primarily in bone metabolism and forms the basis for all skeletal and dental morbid features. Its prevalence is approximately 1 in 20,000 [7]

Pathophysiology of FBS has been well explained in the previous articles [8, 9] The underlying pathology of bone disease in FBS has been simplified and explained by two distinct mechanisms as shown in Figure 8 [8, 9].

Figure 8. shows the flowchart explaining the pathophysiology of bone disease in rickets

Hypophosphatemia in FBS results in hypoplasia and deficient calcification of mineralized structures such as bones and teeth. Among various types of rickets, hypophosphatemic rickets presents mainly with dental manifestations. [10] The skeletal and dental manifestations of hypophosphatemic rickets have been enumerated in Table 2 and Table 3 [7, 11, 12].

Table 2. skeletal manifestations of hypophosphatemic rickets

Table 3. Dental manifeatations of hypophosphatemic rickets

Craniofacial features and various dental abnormalities helps the oral physician to discover underlying systemic disease/ syndrome.. Some of the oral/dental and characteristic skeletal features has been described in the Table 4. [13, 14, 15] Knowledge of such presentations helps in early diagnosis and management of systemic disease /syndrome thus reducing the morbidity of disease and improving the quality of life.

Table 4. Few differential diagnosis simulating the orofacial and skeletal manifestations similar to the present case

Overall prognosis for survival to adulthood in our patient seems to be favorable; Literature reveals at least three more patients of FBS to have reached adulthood in stable condition [2].

Dental considerations: Preventive dental care including counseling and educating the patient on importance of maintenance of good oral hygiene, periodic dental examinations, topical fluoride applications, and pit and fissure sealants should be advised. [10] Dental morbidity in the patient can be managed by oral rehabilitation. This includes a multidisciplinary approach involving the orthodontist, prosthodontist and speech therapist in order to facilitate speech, mastication, and esthetics.

Conclusion: Early diagnosis and management of this category of patients is of upmost importance to minimize the extent of morbidity. Although our patient was diagnosed with Fanconi Bickel syndrome at the age of 2.5 years and has been under meticulous medical management, he presented with severe skeletal and dental manifestations. However, the patient has been able to lead a near normal life of 17 years.

References

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[12]  Aysun Avsar: Dental findings in a child with glycogen storage disease type IA. Quintessence international 2007 ; 37: e36-e40
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